SAN FRANCISCO — ChatGPT is still the world’s most popular chatbot, but its grip on the multibillion-dollar race to rewire the economy with artificial intelligence has begun to slip.

The number of users turning to the ChatGPT mobile app each month has plateaued since the summer, according to data from market research firm Sensor Tower. The chatbot’s maker OpenAI has been eclipsed by rivals such as Google on industry benchmarks comparing the capabilities of different AI systems.

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